A transmission line feed for a surface wave medium having a dielectric substrate with an array of electrically conductive patches formed thereon. The transmission line feed includes a microstrip substrate, the microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the surface wave medium, the microstrip substrate abutting against the dielectric substrate of the surface wave medium; a tapered microstrip disposed on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and an adapter for coupling a transmission line to the relatively narrow end of the tapered microstrip.
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16. A transmission line feed for a surface wave medium, the transmission line feed comprising:
a. a microstrip substrate abutting against the surface wave medium;
b. a tapered microstrip disposed on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave medium; and
c. means for coupling a transmission line to the relatively narrow end of the tapered microstrip.
28. A method of feeding rf energy to a surface wave medium, the rf energy being fed to said surface via a coaxial transmission line feed, said method comprising:
providing a microstrip substrate;
butting the microstrip substrate against the dielectric substrate of the surface wave medium;
forming a tapered microstrip on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and
coupling the coaxial transmission line to the relatively narrow end of the tapered microstrip.
29. A method of feeding rf energy to an ais antenna having a dielectric substrate with an array of electrically conductive patches formed thereon, the rf energy being fed to said ais antenna via a coaxial transmission line feed, said method comprising:
providing a microstrip substrate;
butting the microstrip substrate against the dielectric substrate of the ais antenna;
forming a tapered microstrip on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the ais antenna; and
coupling the coaxial transmission line to the relatively narrow end of the tapered microstrip.
1. A transmission line feed for a surface wave medium having a dielectric substrate with an array of electrically conductive patches formed thereon, the transmission line feed comprising:
a. a microstrip substrate, the microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the surface wave medium, the microstrip substrate abutting against the dielectric substrate of the surface wave medium;
b. a tapered microstrip disposed on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and
c. an adapter for coupling a transmission line to the relatively narrow end of the tapered microstrip.
13. A method of feeding rf energy to an ais antenna having a dielectric substrate with an array of electrically conductive patches formed thereon, the rf energy being fed to said ais antenna via a coaxial transmission line feed, said method comprising:
providing a microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the ais antenna;
butting the microstrip substrate against the dielectric substrate of the ais antenna;
forming a tapered microstrip on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the ais antenna; and
providing an adapter for coupling the coaxial transmission line to the relatively narrow end of the tapered microstrip.
12. A method of feeding rf energy to a surface wave medium having a dielectric substrate with an array of electrically conductive patches formed thereon, the rf energy being fed to said surface via a coaxial transmission line feed, said method comprising:
providing a microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the surface wave medium;
butting the microstrip substrate against the dielectric substrate of the surface wave medium;
forming a tapered microstrip on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and
coupling the coaxial transmission line to the relatively narrow end of the tapered microstrip.
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14. The method of
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30. The method of
31. The method of
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This invention was made under U.S. Government Contract No. HR0011-10-C-0163 and therefor the U.S. Government may have certain rights in this invention.
U.S. patent application Ser. No. 13/243,006, filed on the same date as this application and entitled “Conformal Antennas for Mitigation of Structural Blockage” is hereby incorporated herein by reference.
U.S. Pat. No. 7,307,589 to Daniel Gregoire et al. entitled “Large-Scale Adaptive Surface Sensor Arrays”
A conformal surface wave feed provides a transition from a coaxial line or other transmission line to surface wave transmission that can be used to launch a surface wave onto surface-wave media.
A Conformal Surface Wave Feed (CSWF) is believed to be unknown in the art. The closest prior art may be a low-profile waveguide (LPWG) surface-wave coupler (see
Disadvantages of this prior art are believed to be that: (1) It is not conformal. As seen in the
The present invention relates to CSWF that can be used to feed an AIS antenna or in other applications. The CSWF provides a transition from a coaxial line or other transmission line to surface wave transmission that can be used to launch a surface wave onto surface-wave media of an AIS antenna, for example.
In the CSWF, a wave is launched from a transmission line (typically a 50Ω coax-to-microstrip adaptor) into a tapered microstrip (MS) line that spreads the wave energy out into a broad phase front, and then into a surface-wave medium (SWM). The MS is tapered such that the insertion loss is preferably minimized from one end of the taper to the other. The permittivity of the MS substrate is lower than the permittivity of the SWM substrate in order to match the wave speeds between the MS and the surface wave, thus minimizing insertion loss from the MS to the SWM.
In one aspect the present invention provides a transmission line feed for a surface wave medium having a dielectric substrate with an array of electrically conductive patches formed thereon. The transmission line feed includes: (a) a microstrip substrate, the microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the surface wave medium, the microstrip substrate abutting against the dielectric substrate of the surface wave medium; (b) a tapered microstrip disposed on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and (c) an adapter for coupling a transmission line to the relatively narrow end of the tapered microstrip.
In another aspect the present invention provides a method of feeding RF energy to a surface wave medium having a dielectric substrate with an array of electrically conductive patches formed thereon, the RF energy being fed to said surface via a coaxial transmission line feed. The method includes: providing a microstrip substrate having a first permittivity which is lower than a second permittivity of the dielectric substrate of the surface wave medium; butting the microstrip substrate against the dielectric substrate of the surface wave medium; forming a tapered microstrip on the microstrip substrate, the tapered microstrip tapering from a relatively narrow end to a relatively wide end, the relative wide end terminating where the microstrip substrate abuts against the surface wave substrate; and providing an adapter for coupling the coaxial transmission line to the relatively narrow end of the tapered microstrip.
The CSWF 10 includes a metallic microstrip 13 whose width tapers from a narrow end 11 at a transmission line 15 (typically a 50 ohm coaxial cable) to microstrip adaptor 16 (not shown in
The CSWF 10 need not be coupled to an AIS antenna as the CSWF 10 can be used to interface with SWMs used in devices other than AIS antennas. An SWM is a “surface wave medium”. It is anything that supports surface electromagnetic waves. It is a type of artificial impedance surface (AIS). Not all AIS are SWMs as not all AIS support surface waves—on the contrary, some AIS are designed to inhibit surface waves. However, since an AISA (an AIS antenna) works by purposefully leaking surface waves from it, it is an SWM by definition.
The CSWF 10 has a microstrip taper formed by a metallic layer 13 on a thin dielectric substrate 14 (typically having a thickness in the range of 25-50 mils) with relatively low relative permittivity En (preferably in a range of 2-4). The relative permittivity of layer 14 is low compared to the AIS substrate's 22 relative permittivity ∈r2 which is typically around ˜10. The thickness of the substrates scale inversely to the frequency of operation. For example, 50 mil substrates 14, 22 are preferred for 8 to 14 GHz AIS, 25 mil substrates 14, 22 for 18 to 30 GHz AIS, and 1″ thick substrates 14,22 for 100 to 500 MHz AIS.
The narrow end 11 of the taper preferably interfaces to a standard transmission line connector 30 such as the aforementioned microstrip to coaxial connector. The width of the microstrip at the narrow end is chosen to match its impedance to the 50 ohm adaptor 16 according to well known technology. The wider end 12 of the taper interfaces to a surface-wave medium formed by metallic patches 26 on substrate 22 that supports the desired surface wave.
The taper in the tapered microstrip 13 minimizes insertion loss. Insertion losses of less than −25 dB have been experienced when following the design guidance suggested herein. A surface-wave impedance matching region 24 may be used if needed, which is formed by an array of metallic patches 26 on a dielectric substrate 22 whose permittivity is higher than the substrate 14 under the microstrip taper 13.
Although the CSWF 10 may be used in a number of applications, one currently preferred application is its use as a feed for an AIS antenna 20. See the application identified above for more information about AIS antennas. The AIS antenna 20 typically has metallic patches similar to the metallic patches 26 and may be formed on a substrate integral with substrate 22. The metallic patches of the AIS antenna 20 would typically start out with a uniform size corresponding to the smaller size patches 26 at the end of the surface wave impedance taper region 24 remote from the microstrip taper 13. Thereafter the sizes of patches in the AIS antenna 20 would be varied as discussed in the US patent application incorporated by reference to form transmission regions where the RF signal being applied via coaxial cable 15 (for example) is launched from the surface waves in the AIS antenna 20.
The size of the metal patches 26 varies along the direction of wave propagation denoted by arrow A with the patch size decreasing in size towards the AIS antenna 20.
An embodiment of disclosed CSWF 10 can be utilized, for example, to use surface waves to transmit high-rate data (>30 Mbps) or power (>1 W) in a two-dimensional surface-wave AIS antenna 20.
The disclosed feed will work without the impedance taper 24 (by abutting the tapered microstrip directly to an AIS antenna 20, for example). But the impedance taper 24 is highly desirable to meet specifications for most applications, especially high power applications, since the return loss tends to be unacceptably high without it. The same material as substrate 22 is also preferably used as the substrate of the AIS antenna 20 and, indeed, substrate 22 is preferably shared by the AIS antenna 20 and the surface wave impedance taper 24 as an integral substrate 22.
Conformal artificial impedance surface antennas, which are described in the US patent application which is incorporated by reference, modulate a surface wave and radiate its power into a designed radiation pattern.
In any surface-wave research work, the surface waves must be interfaced to external instruments that rely on conventional RF transmission line communication methods, such as coaxial cables and related connectors. Artificial Impedance Surface antennas 20, whether or not they are conformal, need to be connected to transmitters and/or receivers and thus cables 15 are typically connected to such transmitters and/or receivers and those cables 15 need in turn to be connected to the AIS antenna 20. The disclosed CSWF 10 facilitates that connection.
An important element of the CSWF 10 is its tapered microstrip 13, one end 11 of which interfaces to a conventional transmission line impedance (for example a 50Ω coaxial cable 15), the other end 12 interfaces to a surface-wave medium which typically is in a surface wave impedance taper 24. A very desirable element is the surface-wave impedance taper 24, which matches the wave impedance at the end of the microstrip taper 13 to the surface-wave impedance in the surface-wave medium (SWM) being fed by the CSFW 10, which may be an AIS antenna 20 as described above. Of course, the SWM may comprise something other than an AIS antenna 20 since this invention is useful in launching surface waves from RF signals available in a conventional feed line, such as coaxial cable 15, into a SWM which can be used in a number of possible applications other than a AIS antenna 20.
The tapered microstrip 13 is designed to feed the surface wave in the SWM over a broad area, and the surface wave end 12 of the tapered microstrip 13 is therefore much wider than the coaxial end feed end 11. As the width of the tapered microstrip increases along the taper, the wave impedance changes as a function of its width according to well-known formulas governing microstrip design. The width is varied in such a way that the insertion loss between the wide and narrow ends is minimized. In practice, the impedance along the taper preferably matches what is known as a “Klopfenstein” impedance taper. See Klopfenstein, R. W., “A Transmission Line of Improved Design”, Proceedings of the IRE, pp. 31-35, January 1956. Other types of impedance tapers will work as well.
As such, the taper shape seen in
Wave speeds should be matched between the surface wave and wave in the tapered microstrip 13 at the boundary between the impedance taper 24 and the tapered microstrip 13 in order to minimize insertion loss between the two regions. In order to match the wave speeds, the substrate 14 permittivity ∈1 for the tapered microstrip 13 is lower than the substrate 22 permittivity ∈2 in the surface-wave region. The wave speed in the tapered microstrip 13 is approximately c/∈11/2 over a wide bandwidth, where c is the speed of light and ∈r1 is the relative permittivity of substrate 14. Substrate thickness and tapered microstrip 13 width affect the wave speed in a well-known, but involved way not presented here. (See: I. J. Bahl and D. K. Trivedi, “A Designer's Guide to Microstrip Line”, Microwaves, May 1977, pp. 174-182.) So the wave speed formula given above is just a rough approximation. The surface-wave speed in the surface wave taper region 24 is determined by the wave's frequency, the substrate permittivity ∈2 and its thickness, and the size and shape of the metallic patches 26 on the substrate 22. In general, the surface-wave speed approaches a lower limit of c/∈r21/2 as the frequency and/or the substrate thickness increase (see C. Simovskii et al, “High-impedance surfaces having stable resonance with respect to polarization and incidence angle”, IEEE Trans. Antennas Prop., vol. 53, 908, 2005, and O. Luukkonen et al, “Simple and accurate analytical model of planar grids and high-impedance surfaces comprising metal strips or patches”, IEEE Trans. Antennas Prop., vol. 56, 1624, 2008). As is turns out, the wave speed in the SWM does not get particularly close to the stated limit for patches 26 of a reasonable size, and therefore the permittivity ∈2 of substrate 22 in the surface wave impedance taper 24 region must be greater than the permittivity ∈1 of substrate 14 under tapered microstrip 13.
In some applications, for example certain AIS antennas, the wave speed of the microstrip-guided waves at the end of the tapered microstrip 13 is lower than desired for that application. In this case, the surface-wave speed is caused to increase as the wave moves away from the tapered microstrip 13 by varying the sizes of the metallic patches in the surface-wave impedance taper region 24. The shapes are varied in such a way that the surface-wave impedance is varied in a controlled fashion that minimizes insertion loss from one end of the surface-wave impedance taper region 24. In practice, this is readily accomplished with a Klopfenstein impedance taper in terms of varying the sizes of the patches 26 in surface-wave impedance taper region 24. An impedance taper, such as the Klopfenstein taper, is a mathematical entity. It describes the impedance as a function of distance along a transmission line that matches the impedances between two transmission lines with different impedances. (The SWM can be considered to be a transmission line for surface waves.) For the taper in the microstrip line 16, this is realized with a strip that gradually spreads out. For the surface-wave impedance taper in region 24, the taper is a one-dimensional change in surface-wave impedance with distance. So the patches only have to vary in size along the direction of the propagation as depicted by the arrow of region 24 in
In an AIS antenna 20, the mean surface-wave impedance is relatively low—it is optimum at about 250 to 300 ohms/sq. The impedance necessary to match wave speeds to an SWM at the end of the tapered microstrip 13 is much higher, approximately 500 to 800 ohms/sq. So, in this case, and pretty much for all AIS antennas 20, there has to be a transition region 24 between the AIS antenna's operational surface and the high impedance region where the microstrip 13 terminates and couples to the AIS antenna 20 if a good match is desired. In such a case, an impedance taper in region 24 is essential. In an application where the AIS antenna 20 is just a SWM (like applications with power transfer or data transmission via surface waves), it is admissible to use an AIS (or SWM to be more general) with a high impedance everywhere. Then an impedance taper is not necessary. However, even in these applications, it can be desirable to taper the impedance in region 24 because for example, a lower impedance SWM is easier to make because it uses less metal or is thinner or uses a cheaper dielectric substrate with lower permittivity. These considerations are important when the SWM is very large as for a large scale SWM network. See, for example, U.S. Pat. No. 7,307,589 to Daniel Gregoire et al. entitled “Large-Scale Adaptive Surface Sensor Arrays”.
In power transmission applications, the surface wave is incident on the CSWF 10 from the left. The broad phase front of the surface wave is funneled through the tapered microstrip 13 to the narrow end 11 of the tapered microstrip 13 where it is collected at the coaxial adaptor for downstream RF to DC conversion. Two possible power collection applications are (1) Broadcasting wireless power to a distributed network and (2) broadcasting wireless power from one place to another such as between a satellite and an earth station. With respect to the first possibility, a surface-wave power and communication network distributed across a 1 m2 SWM (again, see U.S. Pat. No. 7,307,589), with a central hub broadcasting data and RF power across the SWM to multiple nodes which collect the RF power, convert it to DC, and use that power to run on-board CPU/radios that communicate with the central hub via surface waves. In the second possibility, the AISA 20 is used as a receiving antenna in wireless power transfer. In that case, microwave power is beamed from one place to another, e.g between a satellite and the earth station. The receiving antenna is an AISA which collects the microwaves on its surface and focuses it to a single point where it is collected by the CSWF 10 and then converted to DC downstream. The same system can work in reverse where the AISA 20 is the power transmitting antenna.
When used in the power collection applications, a broad surface-wave phase front is incident on the tapered microstrip 13, which then funnels the energy in the surface wave phase front down to the coaxial adaptor 16 where it can then be transmitted to an RF-to-DC converter to power devices such as CPUs, varactors, LEDs, etc.
In the tapered microstrip 13, the wave energy is confined to the metallic shape of the microstrip 13. If the RF energy originates from some device (such as a transmitter) coupled to the RF cable 15, the wave energy spreads out as the width of the tapered microstrip 13 increases along the length of the taper, where it then transitions into a surface wave with a broad phase front. If the RF energy originates as surface waves (such as from an AIS antenna 20), then the wave energy concentrates as the width of the tapered microstrip 13 decreases along the length of the taper towards the adapter 16, where it then transitions into a the RF cable 15.
Having described the invention in connection with certain embodiments thereof, modification will now suggest itself to those skilled in the art. As such, the invention is not to be limited to the disclosed embodiments except as is specifically required by the appended claims.
Patent | Priority | Assignee | Title |
10256548, | Jan 31 2014 | KYMETA CORPORATION | Ridged waveguide feed structures for reconfigurable antenna |
10312596, | Jun 20 2014 | HRL Laboratories, LLC | Dual-polarization, circularly-polarized, surface-wave-waveguide, artificial-impedance-surface antenna |
10983194, | Jun 12 2014 | HRL Laboratories LLC | Metasurfaces for improving co-site isolation for electronic warfare applications |
9634397, | Jun 11 2014 | Electronics and Telecommunications Research Institute | Ultra-wideband tapered slot antenna |
Patent | Priority | Assignee | Title |
3267480, | |||
3560978, | |||
3810183, | |||
3961333, | Aug 29 1974 | Texas Instruments Incorporated | Radome wire grid having low pass frequency characteristics |
4045800, | May 22 1975 | Hughes Aircraft Company | Phase steered subarray antenna |
4051477, | Feb 17 1976 | Ball Brothers Research Corporation | Wide beam microstrip radiator |
4087822, | Aug 26 1976 | Raytheon Company | Radio frequency antenna having microstrip feed network and flared radiating aperture |
4119972, | Feb 03 1977 | Phased array antenna control | |
4123759, | Mar 21 1977 | Microwave Associates, Inc. | Phased array antenna |
4124852, | Jan 24 1977 | Raytheon Company | Phased power switching system for scanning antenna array |
4127586, | Jun 19 1970 | Ciba Specialty Chemicals Corporation | Light protection agents |
4150382, | Sep 13 1973 | Wisconsin Alumni Research Foundation | Non-uniform variable guided wave antennas with electronically controllable scanning |
4173759, | Nov 06 1978 | Cubic Corporation | Adaptive antenna array and method of operating same |
4189733, | Dec 08 1978 | NORTHROP CORPORATION, A DEL CORP | Adaptive electronically steerable phased array |
4217587, | Aug 14 1978 | Northrop Grumman Corporation | Antenna beam steering controller |
4220954, | Dec 20 1977 | Marchand Electronic Laboratories, Incorporated | Adaptive antenna system employing FM receiver |
4236158, | Mar 22 1979 | Motorola, Inc. | Steepest descent controller for an adaptive antenna array |
4242685, | Apr 27 1979 | Ball Aerospace & Technologies Corp | Slotted cavity antenna |
4266203, | Feb 25 1977 | Thomson-CSF | Microwave polarization transformer |
4308541, | Dec 21 1979 | Antenna feed system for receiving circular polarization and transmitting linear polarization | |
4367475, | Oct 30 1979 | Ball Aerospace & Technologies Corp | Linearly polarized r.f. radiating slot |
4370659, | Jul 20 1981 | SP-MICROWAVE, INC | Antenna |
4387377, | Jun 24 1980 | Siemens Aktiengesellschaft | Apparatus for converting the polarization of electromagnetic waves |
4395713, | May 06 1980 | Antenna, Incorporated | Transit antenna |
4443802, | Apr 22 1981 | ATCO PRODUCTS, INC , A CORP OF | Stripline fed hybrid slot antenna |
4590478, | Jun 15 1983 | Lockheed Martin Corporation | Multiple ridge antenna |
4594595, | Apr 18 1984 | Lockheed Martin Corporation | Circular log-periodic direction-finder array |
4672386, | Jan 05 1984 | GEC-Marconi Limited | Antenna with radial and edge slot radiators fed with stripline |
4684953, | Jan 09 1984 | McDonnell Douglas Corporation | Reduced height monopole/crossed slot antenna |
4700197, | Jul 02 1984 | HER MAJESTY IN RIGHT OF CANADA AS REPRESENTED BY THE MINISTER OF COMMUNICATIONS | Adaptive array antenna |
4737795, | Jul 25 1986 | General Motors Corporation | Vehicle roof mounted slot antenna with AM and FM grounding |
4749996, | Aug 29 1983 | Raytheon Company | Double tuned, coupled microstrip antenna |
4760402, | May 30 1985 | Nippondenso Co., Ltd. | Antenna system incorporated in the air spoiler of an automobile |
4782346, | Mar 11 1986 | General Electric Company | Finline antennas |
4803494, | Mar 14 1987 | Nortel Networks Limited | Wide band antenna |
4821040, | Dec 23 1986 | Ball Aerospace & Technologies Corp | Circular microstrip vehicular rf antenna |
4835541, | Dec 29 1986 | Ball Corporation | Near-isotropic low-profile microstrip radiator especially suited for use as a mobile vehicle antenna |
4843400, | Aug 09 1988 | SPACE SYSTEMS LORAL, INC , A CORP OF DELAWARE | Aperture coupled circular polarization antenna |
4843403, | Jul 29 1987 | Ball Aerospace & Technologies Corp | Broadband notch antenna |
4853704, | May 23 1988 | Ball Aerospace & Technologies Corp | Notch antenna with microstrip feed |
4903033, | Apr 01 1988 | SPACE SYSTEMS LORAL, INC , A CORP OF DELAWARE | Planar dual polarization antenna |
4905014, | Apr 05 1988 | CPI MALIBU DIVISION | Microwave phasing structures for electromagnetically emulating reflective surfaces and focusing elements of selected geometry |
4916457, | Jun 13 1988 | TELEDYNE INDUSTRIES, INC , A CA CORP | Printed-circuit crossed-slot antenna |
4922263, | Apr 23 1986 | L'Etat Francais, represente par le Ministre des PTT, Centre National | Plate antenna with double crossed polarizations |
4958165, | Jun 09 1987 | THORN EMI PLC, A COMPANY OF GREAT BRITAIN | Circular polarization antenna |
4975712, | Jan 23 1989 | TRW Inc. | Two-dimensional scanning antenna |
5021795, | Jun 23 1989 | Motorola, Inc.; Motorola, Inc | Passive temperature compensation scheme for microstrip antennas |
5023623, | Dec 21 1989 | Raytheon Company | Dual mode antenna apparatus having slotted waveguide and broadband arrays |
5070340, | Jul 06 1989 | Ball Aerospace & Technologies Corp | Broadband microstrip-fed antenna |
5081466, | May 04 1990 | General Dynamics Decision Systems, Inc | Tapered notch antenna |
5115217, | Dec 06 1990 | California Institute of Technology | RF tuning element |
5146235, | Dec 18 1989 | AKG Akustische u. Kino-Gerate Gesellschaft m.b.H. | Helical UHF transmitting and/or receiving antenna |
5158611, | Oct 28 1985 | Sumitomo Chemical Co., Ltd. | Paper coating composition |
5208603, | Jun 15 1990 | The Boeing Company | Frequency selective surface (FSS) |
5218374, | Sep 01 1988 | Bae Systems Information and Electronic Systems Integration INC | Power beaming system with printer circuit radiating elements having resonating cavities |
5235343, | Aug 21 1990 | SOCIETE D ETUDES ET DE REALISATION DE PROTECTION ELECTRONIQUE INFORMATIQUE ELECTRONIQUE SECURITE MARITIME S E R P E-I E S M | High frequency antenna with a variable directing radiation pattern |
5268696, | Apr 06 1992 | Northrop Grumman Systems Corporation | Slotline reflective phase shifting array element utilizing electrostatic switches |
5268701, | Mar 23 1992 | OL SECURITY LIMITED LIABILITY COMPANY | Radio frequency antenna |
5278562, | Aug 07 1992 | Hughes Missile Systems Company; General Dynamics Corporation, Convair Division | Method and apparatus using photoresistive materials as switchable EMI barriers and shielding |
5287116, | May 30 1991 | Kabushiki Kaisha Toshiba | Array antenna generating circularly polarized waves with a plurality of microstrip antennas |
5287118, | Jul 24 1990 | Selex Sensors And Airborne Systems Limited | Layer frequency selective surface assembly and method of modulating the power or frequency characteristics thereof |
5402134, | Mar 01 1993 | R. A. Miller Industries, Inc. | Flat plate antenna module |
5406292, | Jun 09 1993 | Ball Aerospace & Technologies Corp | Crossed-slot antenna having infinite balun feed means |
5519408, | Jan 22 1991 | Tapered notch antenna using coplanar waveguide | |
5525954, | Aug 09 1993 | OKI SEMICONDUCTOR CO , LTD | Stripline resonator |
5531018, | Dec 20 1993 | General Electric Company | Method of micromachining electromagnetically actuated current switches with polyimide reinforcement seals, and switches produced thereby |
5532709, | Nov 02 1994 | Visteon Global Technologies, Inc | Directional antenna for vehicle entry system |
5534877, | Dec 14 1989 | Comsat | Orthogonally polarized dual-band printed circuit antenna employing radiating elements capacitively coupled to feedlines |
5541614, | Apr 04 1995 | Hughes Electronics Corporation | Smart antenna system using microelectromechanically tunable dipole antennas and photonic bandgap materials |
5557291, | May 25 1995 | Raytheon Company | Multiband, phased-array antenna with interleaved tapered-element and waveguide radiators |
5581266, | Jan 04 1993 | ANTSTAR CORP | Printed-circuit crossed-slot antenna |
5589845, | Dec 01 1992 | YANDROFSKI, ROBERT M ; Y DEVELOPMENT, LLC, A COLORADO ENTITY | Tuneable electric antenna apparatus including ferroelectric material |
5598172, | Nov 06 1990 | Thomson - CSF Radant | Dual-polarization microwave lens and its application to a phased-array antenna |
5600325, | Jun 07 1995 | Hughes Aircraft Company | Ferro-electric frequency selective surface radome |
5611940, | Apr 28 1994 | Infineon Technologies AG | Microsystem with integrated circuit and micromechanical component, and production process |
5619365, | Jun 08 1992 | Texas Instruments Incorporated | Elecronically tunable optical periodic surface filters with an alterable resonant frequency |
5619366, | Jun 08 1992 | Texas Instruments Incorporated | Controllable surface filter |
5621571, | Feb 14 1994 | Minnesota Mining and Manufacturing Company | Integrated retroreflective electronic display |
5638946, | Jan 11 1996 | Northeastern University | Micromechanical switch with insulated switch contact |
5644319, | May 31 1995 | Industrial Technology Research Institute | Multi-resonance horizontal-U shaped antenna |
5694134, | Dec 01 1992 | YANDROFSKI, ROBERT M ; Y DEVELOPMENT, LLC, A COLORADO ENTITY | Phased array antenna system including a coplanar waveguide feed arrangement |
5709245, | Sep 23 1994 | The Boeing Company | Optically controlled actuator |
5721194, | Dec 01 1992 | YANDROFSKI, ROBERT M ; Y DEVELOPMENT, LLC, A COLORADO ENTITY | Tuneable microwave devices including fringe effect capacitor incorporating ferroelectric films |
5767807, | Jun 05 1996 | International Business Machines Corporation | Communication system and methods utilizing a reactively controlled directive array |
5808527, | Dec 21 1996 | Hughes Electronics Corporation | Tunable microwave network using microelectromechanical switches |
5874915, | Aug 08 1997 | Raytheon Company | Wideband cylindrical UHF array |
5892485, | Feb 25 1997 | Pacific Antenna Technologies | Dual frequency reflector antenna feed element |
5894288, | Aug 08 1997 | Raytheon Company | Wideband end-fire array |
5905465, | Apr 23 1997 | ARC WIRELESS, INC | Antenna system |
5923303, | Dec 24 1997 | Qwest Communications International Inc | Combined space and polarization diversity antennas |
5926139, | Jul 02 1997 | THE CHASE MANHATTAN BANK, AS COLLATERAL AGENT | Planar dual frequency band antenna |
5929819, | Dec 17 1996 | Hughes Electronics Corporation | Flat antenna for satellite communication |
5943016, | Dec 07 1995 | Titan Aerospace Electronics Division | Tunable microstrip patch antenna and feed network therefor |
5945951, | Sep 03 1997 | Andrew LLC | High isolation dual polarized antenna system with microstrip-fed aperture coupled patches |
5949382, | Sep 28 1990 | Raytheon Company | Dielectric flare notch radiator with separate transmit and receive ports |
5966096, | Apr 24 1996 | HANGER SOLUTIONS, LLC | Compact printed antenna for radiation at low elevation |
5966101, | May 09 1997 | Google Technology Holdings LLC | Multi-layered compact slot antenna structure and method |
6005519, | Sep 04 1996 | Hewlett Packard Enterprise Development LP | Tunable microstrip antenna and method for tuning the same |
6005521, | Apr 25 1996 | Kyocera Corporation | Composite antenna |
6008770, | Jun 24 1996 | Ricoh Company, LTD | Planar antenna and antenna array |
6016125, | Aug 29 1996 | BlackBerry Limited | Antenna device and method for portable radio equipment |
6028561, | Mar 10 1997 | Hitachi, LTD | Tunable slot antenna |
6028692, | Jun 08 1992 | Texas Instruments Incorporated | Controllable optical periodic surface filter |
6034644, | May 30 1997 | Hitachi, Ltd. | Tunable slot antenna with capacitively coupled slot island conductor for precise impedance adjustment |
6034655, | Jul 02 1996 | LG Electronics Inc | Method for controlling white balance in plasma display panel device |
6037905, | Aug 06 1998 | ARMY, UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY | Azimuth steerable antenna |
6040803, | Feb 19 1998 | Ericsson Inc. | Dual band diversity antenna having parasitic radiating element |
6046655, | Nov 10 1997 | L-3 Communications Corporation | Antenna feed system |
6046659, | May 15 1998 | ADVANCED MICROMACHINES INCORPORATED | Design and fabrication of broadband surface-micromachined micro-electro-mechanical switches for microwave and millimeter-wave applications |
6054659, | Mar 09 1998 | General Motors Corporation | Integrated electrostatically-actuated micromachined all-metal micro-relays |
6055079, | Aug 07 1997 | Lawrence Livermore National Security LLC | Optical key system |
6061025, | Dec 07 1995 | Titan Aerospace Electronics Division | Tunable microstrip patch antenna and control system therefor |
6075485, | Nov 03 1998 | Titan Aerospace Electronics Division | Reduced weight artificial dielectric antennas and method for providing the same |
6081235, | Apr 30 1998 | The United States of America as represented by the Administrator of the | High resolution scanning reflectarray antenna |
6081239, | Oct 23 1998 | Gradient Technologies, LLC | Planar antenna including a superstrate lens having an effective dielectric constant |
6097263, | Jun 28 1996 | YANDROFSKI, ROBERT M ; Y DEVELOPMENT, LLC, A COLORADO ENTITY | Method and apparatus for electrically tuning a resonating device |
6097343, | Oct 23 1998 | Northrop Grumman Systems Corporation | Conformal load-bearing antenna system that excites aircraft structure |
6118406, | Dec 21 1998 | The United States of America as represented by the Secretary of the Navy | Broadband direct fed phased array antenna comprising stacked patches |
6118410, | Jul 29 1999 | General Motors Corporation; Delphi Technologies, Inc. | Automobile roof antenna shelf |
6127908, | Nov 17 1997 | Massachusetts Institute of Technology | Microelectro-mechanical system actuator device and reconfigurable circuits utilizing same |
6150989, | Jul 06 1999 | Sky Eye Railway Services International Inc. | Cavity-backed slot antenna resonating at two different frequencies |
6154176, | Aug 07 1998 | KUNG INVESTMENT, LLC | Antennas formed using multilayer ceramic substrates |
6166705, | Jul 20 1999 | NORTH SOUTH HOLDINGS INC | Multi title-configured phased array antenna architecture |
6175337, | Sep 17 1999 | The United States of America as represented by the Secretary of the Army | High-gain, dielectric loaded, slotted waveguide antenna |
6175723, | Aug 12 1998 | Board of Trustees Operating Michigan State University | Self-structuring antenna system with a switchable antenna array and an optimizing controller |
6188369, | May 30 1997 | Hitachi, Ltd. | Tunable slot antenna with capacitively coupled slot island conductor for precise impedance adjustment |
6191724, | Jan 28 1999 | MCEWAN TECHNOLOGIES, LLC A NEVADA CORPORATION | Short pulse microwave transceiver |
6198438, | Oct 04 1999 | The United States of America as represented by the Secretary of the Air | Reconfigurable microstrip antenna array geometry which utilizes micro-electro-mechanical system (MEMS) switches |
6198441, | Jul 21 1998 | Hitachi, Ltd. | Wireless handset |
6204819, | May 22 2000 | Telefonaktiebolaget L.M. Ericsson | Convertible loop/inverted-f antennas and wireless communicators incorporating the same |
6218912, | May 16 1998 | Robert Bosch GmbH | Microwave switch with grooves for isolation of the passages |
6218997, | Apr 20 1998 | Delphi Delco Electronics Europe GmbH | Antenna for a plurality of radio services |
6246377, | Nov 02 1998 | HANGER SOLUTIONS, LLC | Antenna comprising two separate wideband notch regions on one coplanar substrate |
6252473, | Jan 06 1999 | Hughes Electronics Corporation | Polyhedral-shaped redundant coaxial switch |
6285325, | Feb 16 2000 | The United States of America as represented by the Secretary of the Army; ARMY, UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF, THE | Compact wideband microstrip antenna with leaky-wave excitation |
6297579, | Nov 13 2000 | National Technology & Engineering Solutions of Sandia, LLC | Electron gun controlled smart structure |
6307519, | Dec 23 1999 | Hughes Electronics Corporation; Raytheon Company | Multiband antenna system using RF micro-electro-mechanical switches, method for transmitting multiband signals, and signal produced therefrom |
6317095, | Sep 30 1998 | Anritsu Corporation | Planar antenna and method for manufacturing the same |
6323826, | Mar 28 2000 | HRL Laboratories, LLC | Tunable-impedance spiral |
6331257, | May 15 1998 | Hughes Electronics Corporation | Fabrication of broadband surface-micromachined micro-electro-mechanical switches for microwave and millimeter-wave applications |
6337668, | Mar 05 1999 | MATSUSHITA ELECTRIC INDUSTRIAL CO , LTD | Antenna apparatus |
6366254, | Mar 15 2000 | HRL Laboratories, LLC | Planar antenna with switched beam diversity for interference reduction in a mobile environment |
6373349, | Mar 17 2000 | ACHILLES TECHNOLOGY MANAGEMENT CO II, INC | Reconfigurable diplexer for communications applications |
6380895, | Jul 09 1997 | AMC Centurion AB | Trap microstrip PIFA |
6388631, | Mar 19 2001 | HRL Laboratories LLC; Raytheon Company | Reconfigurable interleaved phased array antenna |
6392610, | Oct 29 1999 | SAMSUNG ELECTRONICS CO , LTD | Antenna device for transmitting and/or receiving RF waves |
6404390, | Jun 02 2000 | Industrial Technology Research Institute | Wideband microstrip leaky-wave antenna and its feeding system |
6404401, | Apr 28 2000 | ACHILLES TECHNOLOGY MANAGEMENT CO II, INC | Metamorphic parallel plate antenna |
6407719, | Jul 08 1999 | ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTERNATIONAL | Array antenna |
6417807, | Apr 27 2001 | HRL Laboratories, LLC | Optically controlled RF MEMS switch array for reconfigurable broadband reflective antennas |
6424319, | Nov 18 1999 | Joyson Safety Systems Acquisition LLC | Multi-beam antenna |
6426722, | Mar 08 2000 | HRL Laboratories, LLC | Polarization converting radio frequency reflecting surface |
6440767, | Jan 23 2001 | HRL Laboratories, LLC | Monolithic single pole double throw RF MEMS switch |
6469673, | Jun 30 2000 | Nokia Technologies Oy | Antenna circuit arrangement and testing method |
6473362, | Apr 30 2001 | Information System Laboratories, Inc. | Narrowband beamformer using nonlinear oscillators |
6483480, | Mar 29 2000 | HRL Laboratories, LLC | Tunable impedance surface |
6496155, | Mar 29 2000 | Raytheon Company | End-fire antenna or array on surface with tunable impedance |
6515635, | Sep 22 2000 | IPR LICENSING, INC | Adaptive antenna for use in wireless communication systems |
6518931, | Mar 15 2000 | HRL Laboratories, LLC | Vivaldi cloverleaf antenna |
6525695, | Apr 30 2001 | Titan Aerospace Electronics Division | Reconfigurable artificial magnetic conductor using voltage controlled capacitors with coplanar resistive biasing network |
6538621, | Mar 29 2000 | HRL Laboratories, LLC | Tunable impedance surface |
6552696, | Mar 29 2000 | HRL Laboratories, LLC | Electronically tunable reflector |
6624720, | Aug 15 2002 | Raytheon Company | Micro electro-mechanical system (MEMS) transfer switch for wideband device |
6642889, | May 03 2002 | Raytheon Company | Asymmetric-element reflect array antenna |
6657525, | May 31 2002 | Northrop Grumman Systems Corporation | Microelectromechanical RF switch |
6741207, | Jun 30 2000 | Raytheon Company | Multi-bit phase shifters using MEM RF switches |
6822622, | Jul 29 2002 | BAE SYSTEMS SPACE & MISSION SYSTEMS INC | Electronically reconfigurable microwave lens and shutter using cascaded frequency selective surfaces and polyimide macro-electro-mechanical systems |
6864848, | Dec 27 2001 | HRL Laboratories, LLC | RF MEMs-tuned slot antenna and a method of making same |
6897810, | Nov 13 2002 | Hon Hai Precision Ind. Co., LTD | Multi-band antenna |
6940363, | Dec 17 2002 | Intel Corporation | Switch architecture using MEMS switches and solid state switches in parallel |
7068234, | May 12 2003 | HRL Laboratories, LLC | Meta-element antenna and array |
7071888, | May 12 2003 | HRL Laboratories, LLC | Steerable leaky wave antenna capable of both forward and backward radiation |
7164387, | May 12 2003 | HRL Laboratories, LLC | Compact tunable antenna |
7173565, | Jul 30 2004 | HRL Laboratories, LLC | Tunable frequency selective surface |
7218281, | Jul 01 2005 | HRL Laboratories, LLC | Artificial impedance structure |
7245269, | May 12 2003 | HRL Laboratories, LLC | Adaptive beam forming antenna system using a tunable impedance surface |
7253699, | May 12 2003 | HRL Laboratories, LLC | RF MEMS switch with integrated impedance matching structure |
7253780, | May 12 2003 | HRL Laboratories, LLC | Steerable leaky wave antenna capable of both forward and backward radiation |
7276990, | May 15 2002 | HRL Laboratories, LLC | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same |
7298228, | May 15 2002 | HRL Laboratories, LLC | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same |
7307589, | Dec 29 2005 | HRL Laboratories, LLC | Large-scale adaptive surface sensor arrays |
7782255, | Oct 23 2007 | The Boeing Company | System and methods for radar and communications applications |
7791251, | Mar 17 2005 | INHA-INDUSTRY PARTNERSHIP INSTITUTE | Biomimetic electro-active paper actuators |
7830310, | Jul 01 2005 | HRL Laboratories, LLC | Artificial impedance structure |
7911386, | May 23 2006 | Regents of the University of California, The | Multi-band radiating elements with composite right/left-handed meta-material transmission line |
8212739, | May 15 2007 | HRL Laboratories, LLC | Multiband tunable impedance surface |
8436785, | Nov 03 2010 | HRL Laboratories, LLC | Electrically tunable surface impedance structure with suppressed backward wave |
20010035801, | |||
20020036586, | |||
20030034922, | |||
20030193446, | |||
20030222738, | |||
20030227351, | |||
20040113713, | |||
20040135649, | |||
20040227583, | |||
20040227664, | |||
20040227667, | |||
20040227668, | |||
20040227678, | |||
20040263408, | |||
20050012667, | |||
20060192465, | |||
DE19600609, | |||
EP539297, | |||
EP1158605, | |||
FR2785476, | |||
GB1145208, | |||
GB2281662, | |||
GB2328748, | |||
JP61260702, | |||
WO44012, | |||
WO131737, | |||
WO173891, | |||
WO173893, | |||
WO3009501, | |||
WO3098732, | |||
WO9400891, | |||
WO9629621, | |||
WO9821734, | |||
WO9950929, |
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